Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
83.3
74
81
88
82
86
February
84.0
97
97
89
75
75
March
90.9
77
90
98
97
90
April
92.4
98
95
95
91
May
92.6
96
100
95
91
June
94.3
98
100
95
97
July
88.2
100
64
74
96
August
70.9
98
100
18
92
September
80.9
93
99
91
47
October
91.2
93
99
90
86
November
92.9
97
90
96
93
December
86.8
88
75
93
84
Average
87.8
84.5
91.9
91.7
82.7
86.0
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.
Maximum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
5.1
3
8
3
4
8
February
8.9
12
13
9
3
7
March
13.2
13
12
14
15
15
April
16.2
16
14
18
16
May
22.2
20
21
22
21
June
26.4
24
26
27
28
July
28.5
27
27
28
31
August
27.3
26
25
29
28
September
25.0
23
22
25
24
October
19.6
20
19
21
18
November
12.1
13
13
11
15
December
8.4
10
8
13
7
Average
15.1
9.1
17.3
17.0
18.0
18.1
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-3.5
-3
1
-5
-2
0
February
-1.3
1
1
-2
-5
-1
March
3.4
7
3
3
3
5
April
6.8
10
9
6
5
May
14.6
17
20
10
11
June
18.7
22
24
17
16
July
21.4
26
27
18
19
August
19.8
23
23
19
17
September
15.3
16
18
14
14
October
8.0
9
5
11
8
November
1.6
2
3
1
4
December
-1.8
1
0
2
-2
Average
6.4
1.1
10.8
10.7
7.8
8.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2024
2023
2022
2021
2020
January
7.0
7
7
7
7
7
February
7.5
7
9
8
6
7
March
8.1
6
8
9
8
8
April
6.9
7
7
7
6
May
5.1
5
5
5
3
June
4.7
5
4
5
4
July
3.5
4
4
4
2
August
3.3
4
4
4
2
September
3.9
4
7
5
2
October
5.8
6
7
5
5
November
6.5
6
7
6
7
December
6.8
6
6
8
7
Average
6.3
6.9
6.7
7.1
5.7
4.7
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
244°
230°
264°
243°
225°
February
234°
227°
224°
288°
236°
March
232°
250°
231°
227°
237°
April
251°
225°
236°
254°
May
050°
180°
224°
230°
June
279°
274°
206°
227°
July
248°
278°
251°
246°
August
274°
238°
212°
244°
September
060°
013°
233°
277°
October
250°
228°
223°
227°
November
224°
227°
228°
228°
December
218°
224°
216°
229°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.